#include<stdio.h>
int max(int x, int y)
{
	int tmp;
	if (x > y)
		tmp = x;
	else
		tmp = y;
	return tmp;
}
int min(int x, int y)
{
	int tmp;
	if (x < y)
		tmp = x;
	else
		tmp = y;
	return tmp;
}
int main()
{
	int(*p)(int, int);
	int num;
	num = max(10, 20);
	printf("num=%d\n", num);
	return 0;
}